We averaged these three metrics to figure out the most conservative members of the House of Representatives last session.

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Before we start, here's the methodology each House rating used:

AP

The Club for Growth identified 23 votes that they considered crucial indicators of a member's commitment to their idea of economic liberty, each weighted for importance. The votes with the highest weights included the Obamacare repeal, the Bush tax cut extensions, the vote on the Republican Study Committee budget, and a measure to freeze regulations.

The ACU weighting identified 25 bills, all equally weighted, that they considered hallmarks of conservative voting. These included referendums on spending, domestic energy, health care, traditional marriage and missile defense.

The National Journal analyzed 659 "meaningful" votes that identified ideological distinctions. After splitting these into social, economic and foreign issues, they developed a score for each member's liberal and conservative cred.

We averaged the final 2012 scores from each rating to get the aggregate score.